Herman f



H. E. GERHARD.

COVERED PULLEY.

APPLICATION FILED AUG.2 |918.

'l ,$309,284. Patented J uly- 8, 1919.

o cV//Q o c3 m0 Q 26%0 O l O 0 o c3 G //o G' f HERMAN F. annum, orUNIVERSITY, rarssonni.

' covnnnn PULLEY.

To all whom it may concern:

Be it known that I, HERMAN F. GERHARD,

a citizen of theUnited States, residing atv 6665 Kingsbury-Blvd.,University, and State of Missouri, have invented new and usefulImprovements in Covered Pulleys, of which the following is aspecification.

This invention relates to covered pulleys and method of covering thesame, the main object of the invention being `to provide a pulley with acovering of material that will tend to prevent slippage ofthe belt, and

which covering will be securely held uponA the surface of the pulley.

The invention may be applied .indiffercntly to wooden or metal pulleys;but the advantages thereof are more apparent in connection with metalpulleys, which' have always proven diiiicult to provide with covcrs thatwill remain securely fixed to the surface of the pulley for anyconsiderable time.

According to my invention I use a covering of open work material, suchas may be produced by a fabric made from Woven cords presentinginterstices between them. Such material is illustrated by a well knowntype of press cloth, which, as a matter of fact, I find veryadvantageous touse. may, however, take other material, such as leather,canvas,or the like, and provide the same with interstices by punching 0rcutting small openings therein'. The covering is secured .to the pulleythrough the medium of a suitable cement, 4which is applied in sufiicientquantity not only to cover the surface of the pulley, but to projectinto and fill the interstices of the fabric or other covering. After thecement hardens, there will be a large number of projections on thesurface of the' ulley, formed by the hardened cementwhic has filled theinterstices in the covering, and these projections, extending entirelyaround the surface of the pulley, and extending through said intersticesand engaging the walls thereof, tend to, anddo, preventslippage of thecovering about the pulley, so that av pulley so covered may be used fora great period of time, as compared with the life of covers as atpresentapplied, without it being necessary to renew the covering. f Y. I

The cement I employ is one winch will V Specification of Letters PatentsPtentlgd July 8, 5.919. l Application led 'August 2, 1918. Serial No.243,042.

hardenby evaporation, or oxidation, and.

any cement that will bind the covering to the surfaceof the pulley, thatis to say, that will adhere to metal, or woodand fabric, leather,

or the like, andwhic) possesses the property of hardening, may beemployed. l In the accompanying drawing: V

pulley with the coveringapplied thereto accordlng to my invention;

, so Figure 1 is a plan View, of avportion'of a Fi 2 is a fragmentalside elevation showing t. e pulley as it would appear with Athecoveringremoved, to illustrate the serieslof projections formed by thecement filling the interstices of the, covering;

Fig. 3 is al .viewof a section of open work fabric, such as I mi ht use;and,

Fig. 4 1s a views owing a section of any cement. After this firstcoating of cement has been allowed to harden to a greater or' `lessdegree, I aply a second coating of cement. 'I then p ace the coveringabout the pulley and thencoat the covering with the cement, making surethat all of the interstices are filled with the cement. A hand rollermay be used to firmly press the covering about the pulley and to insurethat the cement is forced into and lls the interstices of the covering.The cement is then allowed to harden, and the pulley will have theappearance shown in Fig. 1.

The numeral 1 in the drawing indicates the pulley, 2v the covering, 3the interstices inthe latter, 4f the layer of cement securing suitablecovering material having interstices.

the cover to the pulleyand 5 the proj ectionsv formed by the cementfilling the said inter-A ping or tra/ctive eect onthe inner Asurf-dce ofi of -sid cover thereby .presenting nur'nerous -a belt applied thereto,v4-ixed projections integral with the coating 2. Apulley having acoverthereon afford# of cement and'engagmg thelvwalls of said l0 ing freeopenlngs of considerable areal said openings.

cover being secured tothepulley bymeans In testimony whereof I havehereunto set ofan interposed coating .of hardened cement ymy hand. v. cwhich has been'ceused to ll the openings GERHARD.

